Adding fraction of filter divergence in AEC metrics.

webrtc/modules/audio_processing/aec/aec_core_internal.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 100 matching lines @@
   PowerLevel nearlevel;
   PowerLevel linoutlevel;
   PowerLevel nlpoutlevel;
 
   int metricsMode;
   int stateCounter;
   Stats erl;
   Stats erle;
   Stats aNlp;
   Stats rerl;
+  int num_diverge_values;
+  int num_filter_diverge;

[peah-webrtc, 2016/02/29 14:05:56]

I think it would make sense to bundle these into a struct instead as they
belong, and are only usable, together. That would simplify code readability and
refactorability.

You could then also more easily name the variables. Currently I think it could
be more clear from the variable names what they store.

+  float fraction_filter_diverge;
 
   // Quantities to control H band scaling for SWB input
   int freq_avg_ic;       // initial bin for averaging nlp gain
   int flag_Hband_cn;     // for comfort noise
   float cn_scale_Hband;  // scale for comfort noise in H band
 
   int delay_metrics_delivered;
   int delay_histogram[kHistorySizeBlocks];
   int num_delay_values;
   int delay_median;
@@ skipping 90 matching lines @@
 extern WebRtcAecPartitionDelay WebRtcAec_PartitionDelay;
 
 typedef void (*WebRtcAecStoreAsComplex)(const float* data,
                                         float data_complex[2][PART_LEN1]);
 extern WebRtcAecStoreAsComplex WebRtcAec_StoreAsComplex;
 
 typedef void (*WebRtcAecWindowData)(float* x_windowed, const float* x);
 extern WebRtcAecWindowData WebRtcAec_WindowData;
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_INTERNAL_H_